Filter magnet structure



Feb. 24, 1948 T. E. BROOKS 2,436,740

FILTER MAGNET swnucwuns Filed Sept. 21, 194:5

ll 7 i 4 I Patented F eb. 24, 1948 MAGNET STRUCTURE Thomas E. Broo Chi-hula, Iowa, asslgnor to ks, Lisle Corporation, Clarinda, Iowa, a corporation of Iowa Application September 21, 1943, Serial No. 503,220 4 Claims. 210-15) My present invention relates to a filter mag net structure whereby magnets may be loosely placed in a container of liquid from which ferrous particles are to be filtered by being attracted by the magnets.

One object of the invention is to provide a frame of non-ferrous material for the magnet, which frame is of open character to permit ready flow of fluid past the magnet and to permit the magnet to freely attract particles from the liquid, the frame being so related to the magnet that at least the poles of the magnet are spaced from any adjacent structures, such as other filter magnet structures or a housing in which the magnet structures are placed.

Another object is to provide a frame which may be inexpensive and light in weight, yet which may be readily formed for enclosing a magnet and assembled around the magnet to effect spacing of the magnets from each other or from a housing or the like when a, plurality of filter magnet structures are placed in the housing.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my fliter magnet structure whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawing, wherein:

Figure 1 is a side elevation of a filter magnet structure embodying my present invention;

Figure 2 is a bottom plan view thereof on an enlarged scale;

Figure 3 is a sectional view on the line 33 of Figure 2;

Figure 4 is an end elevation thereof;

Figure 5 is a lay-out view of the sheet metal frame for the magnet structure. showing how it is cut and where it is bent; and

Figure 6 is a cross-sectional view through a pipe line in which a housing is mounted, a pinrality of my filter magnet structures-being shown diagrammatically in the housing for filtering ferrous particles from liquid flowing through the pipe line by reason of the magnets attracting such ferrous particles from the liquid as it flows past the magnets.

On the accompanying drawing, I have used the reference character M to indicate a magnet, such as one of horseshoe shape. A frame F is provided for supporting the magnet and this frame may consist of a strip of sheet brass or the like having the general shape shown in Figure 5. Specifically, the frame F has a, pair of T-shaped openings in at opposite ends thereof, the sheet ing frame which 2 metal being cut as shown in solid lines and then bent along the dotted lines indicated at i2. The resulting flanges i4 coact withthe magnet M by engaging the end surfaces of the arms, and the tongues it of the flanges it enter between the arms to hold the magnet against lateral movement relative to the frame F.

Two more openings l8 and 2d are cut out of the frame F and an opening 22 is cut so that when bent along a line 24 a, flange 26 results. This flange may engage the ends of the magnet arms, as shown in Figures 1, 3 and 4, so that the magnet is supported by the three flanges l4-i4 and 23. At the same time, the magnet is held against side movement (toward the right or left in Figure 4) by the tongues I 6.

The frame F is bent U-shaped, as shown in Figures 1 and 3, and for retaining the magnet against the flanges Ill-I4 and 28, I provide a strap 28 which may also be formed of brass and which is threaded through the two openings ill and bent to form a substantially closed clip. Thus a. very simple assembly proposition is provided, consisting of bending the flat frame F of Figlne 5 to the shape shown in Figure 3, and then fastening the frame around the magnet by bending the strap 28 to form a retainer clip.

A filter magnet structure of the kind described has the important characteristic of a supportspaces the magnet from all surrounding objects. A plurality of such filter magnet structures may accordingly be placed loosely in a container of liquid, such as a T-fltting or housing 30, shown in Figure 6, which housing is interposed in a pipe line 323l. The framework F is open so that the liquid flows freely around the magnets and any ferrous particles in the liquid are attracted by the magnets as at 36 and thus filtered from the liquid flowing through the pipe line. Although I have shown the frame as having its extremities spaced outwardly from all extremities of the magnet, this is most important at the poles. The center portions of the magnets can touch each other without reducing the magnetic fleld appreciably and the frame can therefore be omitted at this point if desired.

The filter magnet structures, aside from being spaced from each other, are also spaced from the housing 30 by their frames F. The housing may be of iron or the like and would therefore shortcircuit the magnets if they came in contact with it. The spacing of the extremities of the frame F from at least the poles of the magnet M is therefore an important feature of my invention.

The filter magnet structures may be placed loosely in the housing 39 or may be chained together by a chain or the like 81' (preferably nonmagnetic), as shown in Figure 6, and connected to a, clean-out plug 38. when the plug is un- I screwed, the magnet structures can be lifted out and the ferrous particles 38 cleaned from them, whereupon they can be replaced for further operation. When the chain 31 is not provided, the

plug 39 can be removed, and the filter magnet nets, and the liquid fiowing past them is sub- 5 stantlally unrestricted, if the container for the magnet structures is made slightly larger thanthe pipe line in which the container is mounted. The filter magnets have the desirable characteristic of easy installation in a variety of strucgo tures from which magnetic particles are to be filtered, and may be readily removed and cleaned, whereupon they are ready for further filtering operations as soon as they are replaced in their container.

The frame F may be varied greatly in shape, yet accomplish the same purpose, and may also be designed for supporting magnets other than those of the horseshoe type. Changes of this character willbe obvious to anyone skilled in the art, the main requisite being the spacing of the extremities of the frame from at least the polar extremities of the magnet, so that there can be no contact between the magnet poles themselves,

the limits of the frame to the magnet, said spacer elements engaging the magnet to hold it centered in said frame.

2. A filter magnet structure comprising a U-shaped magnet, and an open sheet metal frame work for supporting said magnet independent of all other structures, said frame work having its extremities spaced from the outline of the magnet and having tongue-like spacer elements struck therefrom to effect such spacing, some of said tongue-like spacer elements being shouldered and having portions fitting between the poles of the magnet and other portions engaging the edges of said poles.

3. A magnet structure of the character described comprising a U-shaped magnet, a U- shaped sheet metal frame for said magnet, said frame having spacer elements struck therefrom and extending inwardly for engaging and supporting the magnet within said frame, with the pole ends of the magnet spaced inwardly from the outer extremities of the frame, and a keeper for said frame relative to said magnet, said keeper connecting the ends of the arms of said U- shaped frame together adjacent the bend of the U-shaped magnet.

4. For use with a housing through which liquid flows, said housing being connected in a pipe line which is smaller in diameter than said housing; a removable plug for said housing, a plurality of magnets, a frame around each magnet for spacing the magnet from said housing and for spacing the magnets from each other, and flexible means connecting each of said frames to said and they are prevented from contact with other to plug.

surrounding structures, such as their housing.

Although I have described the frame F as being of non-magnetic material, I have found that it may be made of ferrous material and still ac- THOMAS E, BROOKS.

REFERENCES CITED The following references are of record in the complish spacing of the magnets without sac- 40 me of this ,patent:

rificing much efiiciency. This is particularly true if the spacing between the outer surfaces of the magnet and the extremities of the frame are well spaced from each other.

Some changes may be made in the construction and arrangement of the parts of my filter magnet structure without departing from the real spirit and purpose of my invention.

I claim as my invention:

1. In a filter magnet structure, a permanent magnet, and a frame for supporting said magnet,

said frame comprising a strip of sheet metal bent U-shape and having perforations for free flow of fiuid therethrough, said frame having its limits spaced from the outer surface of the magnet 5 and having spacer elements bent inwardly from the edges of said perforations and extending from UNITED STATES PATENTS Number Name Date 512,381 Keyes Jan. 9, 1894 759,932 Sturtevant May 17, 1904 974,047 Frederickson Oct, 25, 1910 1,425,366 Chapman Aug. 8, 1922 2,146,588 Merrill Feb. 7, 1939 2,307,205 Ewaid Jan. 5, 1943 2,350,741 Ford June 6, 1944 FOREIGN PATENTS Number Country Date 6,903 Great Britain 1888 131,523 Germany June 13, 1902 216,763 Switzerland Jan, 5, 1942 241,361 Great Britain Oct. 22, 1925 

